president obama aaddressed the u.n. general assembly addressing iran's efforts to build nuclear weapons. >> a nuclear-armed iran is not a challenge that can be contained. >> reporter: those strong words didn't satisfy romney. >> we can look at the record the last four years. is iran closer to a nuclear weapon or not? we know the answer. it's closer to a nuclear weapon. >> reporter: and both candidates tried to one up each other in praising bill clinton at the former president's global conference on global giving. romney joked about the clinton bounce in obama's polls after the democratic convention. >> if there's one thing we've learned in this election season, by the way, it's that a few words from bill clinton can do a man a lot of good. all i have to do is wait for that bounce to happen in a couple of minutes days. >> your very kind introduction, i have to admit i really did like the speech a few weeks ago a little bit better. >> reporter: a couple of new polls, by the way, out this morning in the "new york times". j